Try watching the videos in 1.5x or 2x speed on youtube. This gives you the same information density as reading and you don't miss the nice animations travisb mentioned.

We are pretty light on whitepapers and stuff, but we have this: http://millcomputing.com/topic/introduction-to-the-mill-cpu-...

You might try http://liberomnia.org/wiki/Computer/The_Mill.en.html for an overview, though the animations in the videos do make it significantly easier to achieve an intuitive understanding in many cases.